Vonage iPhone app allows free calls to Facebook friends

The Vonage application, which can be downloaded for free, brings your Facebook friends into your phone's contacts book and allows you to call or IM those who have also downloaded the app over Wi-Fi and 3G connections for nowt.

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In essence, it's a VoIP service like Skype, but uses actual phone numbers rather than an online account. The best part is that it works both nationally and internationally, which could eliminate those crushing oversees call rates for good.